<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

</body>

</html>
<script>
    var arr = [1, 34, 56, 12, 34, 78, 33, 43]
    function map(arr) {
        var arr2 = []
        for (var i = 0; i < arr.length; i++) {
            arr2[i] = arr[i] * 1.3
        }
        return arr2
    }
 
map(arr)
console.log(map(arr));

</script>